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A compound ‘X’ upon reaction with H2O produces a colorless gas ‘Y’ with rotten fish smell. Gas ‘Y’ is absorbed in a solution of CuSO4 to give Cu3P2 as one of the products. Predict the compound ‘X’.

1. Ca3(PO4)2
2. Ca3P2
3. NH4Cl
4. As2O3

Correct answer: Ca3P2

Solution

The compound 'X' is Ca3P2 (calcium phosphide). When it reacts with water, it produces phosphine gas (PH3), which has a rotten fish smell. Phosphine reacts with CuSO4 to form Cu3P2, confirming the identity of 'X'.

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